Horizontal LED Unit Layout for Flexible Display Mounting
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Solution Overview
Problem
Existing LED display technologies face challenges in reducing time consumption during the mounting process due to the need for precise stacking sequences of LEDs and interference from electrodes affecting light emission, as well as difficulties in repairing defective LEDs.
Innovation Solution
A novel light emitting device structure where LEDs are stacked horizontally on a display substrate, allowing for flexible stacking sequences and easy repair through division of semiconductor layers into regions, enabling independent operation and maintenance of each LED unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a stack type light emitting device is used to reduce the number of light emitting devices, then the number of light emitting devices is reduced to 1/3, but the stacking sequence is restricted by light absorption and electrodes affect light emitting regions
Solution Approach 1:
The patent transitions from vertical stacking (stack type) to horizontal arrangement of LED units. Each LED unit contains vertically stacked semiconductor layers emitting different colors, but the units themselves are arranged horizontally on the substrate. This dimensional change eliminates light absorption interference between different color LEDs and allows flexible stacking sequences without affecting light emission quality.
2Manufacturing precision
If individual light emitting devices are arranged on each subpixel to realize various colors, then color accuracy is improved, but time consumption in mounting process increases
Solution Approach 1:
The patent merges multiple LED units (emitting different colors) into a single integrated light emitting device structure. Each LED unit contains semiconductor layers for different colors arranged vertically, and multiple such units are horizontally arranged on one substrate. This merging reduces the total number of separate mounting operations while maintaining color accuracy through the multi-color capability of each integrated unit.
3Productivity
If stack type light emitting device is used to reduce number of devices, then mounting time is reduced, but repair of defective LEDs becomes more difficult
Solution Approach 1:
The patent segments the light emitting device into multiple independent LED units, where each unit contains semiconductor layers for different colors. These units are horizontally arranged and can be independently addressed and replaced. If one LED unit becomes defective, only that specific unit needs to be replaced rather than the entire stacked structure, significantly improving repairability while maintaining the reduced device count benefit.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach reduces time consumption in the mounting process, allows for flexible LED stacking without wavelength restrictions, and facilitates easy repair of defective LEDs, improving the efficiency and reliability of LED display apparatuses.
Implementation Method 1
a first LED unit including a first light emitting stack, a second LED unit including a second light emitting stack, and a third LED unit including a third light emitting stack
Implementation Method 2
Each of the first to third light emitting stacks includes a first conductivity type semiconductor layer and a second conductivity type semiconductor layer
Data Source
AI summary
A display apparatus includes a display substrate, and light emitting devices arranged on an upper surface of the display substrate. At least one of the light emitting devices includes a first LED unit including a first light emitting stack, a second LED unit including a second light emitting stack, and a third LED unit including a third light emitting stack. Each of the first to third light emitting stacks includes a first conductivity type semiconductor layer and a second conductivity type semiconductor layer. the first conductivity type semiconductor layer and the second conductivity type semiconductor layer in each of the first to third light emitting stacks are stacked in a horizontal direction with respect to the upper surface of the display substrate. At least one of the second conductivity type semiconductor layers in the first to third light emitting stacks is divided into two regions.